In which of the following pairs of structure are tetrahedral as well as octahedral voids respectively?
(a) Bcc and FCC
(b) Hcp and simple cubic
(c) Hcp and ccp
(d) Bcc and hcp
Correct Answer is: (c) Hcp and ccp
In Hexagonal closed packing -
• No of atoms => 12
• No of tetra. Voids => 12
• No of octahedral voids => 6
In Cubic closed packing -
• No of atoms => 4
• No of tetra. voids => 8
• No of octahedral voids => 4